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<![endif]--> <nav class="sidebar"> <div class="sidebar-menu">☰</div> <a href='../../../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> </nav> <div class="theme-picker"> <button id="theme-picker" aria-label="Pick another theme!"> <img src="../../../../../brush.svg" width="18" alt="Pick another theme!"> </button> <div id="theme-choices"></div> </div> <script src="../../../../../theme.js"></script> <nav class="sub"> <form class="search-form js-only"> <div class="search-container"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"> </div> </form> </nav> <section id='main' class="content"><pre class="line-numbers"><span id="1"> 1</span> <span id="2"> 2</span> <span id="3"> 3</span> <span id="4"> 4</span> <span id="5"> 5</span> <span id="6"> 6</span> <span id="7"> 7</span> <span id="8"> 8</span> <span id="9"> 9</span> <span 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id="471">471</span> <span id="472">472</span> <span id="473">473</span> <span id="474">474</span> <span id="475">475</span> <span id="476">476</span> <span id="477">477</span> <span id="478">478</span> <span id="479">479</span> <span id="480">480</span> <span id="481">481</span> <span id="482">482</span> <span id="483">483</span> <span id="484">484</span> <span id="485">485</span> <span id="486">486</span> <span id="487">487</span> <span id="488">488</span> <span id="489">489</span> <span id="490">490</span> <span id="491">491</span> <span id="492">492</span> <span id="493">493</span> </pre><pre class="rust "> <span class="comment">// Copyright 2016 The Rust Project Developers. See the COPYRIGHT</span> <span class="comment">// file at the top-level directory of this distribution and at</span> <span class="comment">// http://rust-lang.org/COPYRIGHT.</span> <span class="comment">//</span> <span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span> <span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span> <span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span> <span class="comment">// option. This file may not be copied, modified, or distributed</span> <span class="comment">// except according to those terms.</span> <span class="kw">use</span> <span class="ident">os</span>::<span class="ident">unix</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>; <span class="kw">use</span> <span class="ident">ffi</span>::{<span class="ident">OsString</span>, <span class="ident">OsStr</span>, <span class="ident">CString</span>, <span class="ident">CStr</span>}; <span class="kw">use</span> <span class="ident">fmt</span>; <span class="kw">use</span> <span class="ident">io</span>; <span class="kw">use</span> <span class="ident">libc</span>::{<span class="self">self</span>, <span class="ident">c_int</span>, <span class="ident">gid_t</span>, <span class="ident">uid_t</span>, <span class="ident">c_char</span>}; <span class="kw">use</span> <span class="ident">ptr</span>; <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">fd</span>::<span class="ident">FileDesc</span>; <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">fs</span>::{<span class="ident">File</span>, <span class="ident">OpenOptions</span>}; <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">pipe</span>::{<span class="self">self</span>, <span class="ident">AnonPipe</span>}; <span class="kw">use</span> <span class="ident">sys_common</span>::<span class="ident">process</span>::{<span class="ident">CommandEnv</span>, <span class="ident">DefaultEnvKey</span>}; <span class="kw">use</span> <span class="ident">collections</span>::<span class="ident">BTreeMap</span>; <span class="comment">////////////////////////////////////////////////////////////////////////////////</span> <span class="comment">// Command</span> <span class="comment">////////////////////////////////////////////////////////////////////////////////</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Command</span> { <span class="comment">// Currently we try hard to ensure that the call to `.exec()` doesn't</span> <span class="comment">// actually allocate any memory. While many platforms try to ensure that</span> <span class="comment">// memory allocation works after a fork in a multithreaded process, it's</span> <span class="comment">// been observed to be buggy and somewhat unreliable, so we do our best to</span> <span class="comment">// just not do it at all!</span> <span class="comment">//</span> <span class="comment">// Along those lines, the `argv` and `envp` raw pointers here are exactly</span> <span class="comment">// what's gonna get passed to `execvp`. The `argv` array starts with the</span> <span class="comment">// `program` and ends with a NULL, and the `envp` pointer, if present, is</span> <span class="comment">// also null-terminated.</span> <span class="comment">//</span> <span class="comment">// Right now we don't support removing arguments, so there's no much fancy</span> <span class="comment">// support there, but we support adding and removing environment variables,</span> <span class="comment">// so a side table is used to track where in the `envp` array each key is</span> <span class="comment">// located. Whenever we add a key we update it in place if it's already</span> <span class="comment">// present, and whenever we remove a key we update the locations of all</span> <span class="comment">// other keys.</span> <span class="ident">program</span>: <span class="ident">CString</span>, <span class="ident">args</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">CString</span><span class="op">></span>, <span class="ident">argv</span>: <span class="ident">Argv</span>, <span class="ident">env</span>: <span class="ident">CommandEnv</span><span class="op"><</span><span class="ident">DefaultEnvKey</span><span class="op">></span>, <span class="ident">cwd</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">CString</span><span class="op">></span>, <span class="ident">uid</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">uid_t</span><span class="op">></span>, <span class="ident">gid</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">gid_t</span><span class="op">></span>, <span class="ident">saw_nul</span>: <span class="ident">bool</span>, <span class="ident">closures</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">FnMut</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">>></span>, <span class="ident">stdin</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Stdio</span><span class="op">></span>, <span class="ident">stdout</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Stdio</span><span class="op">></span>, <span class="ident">stderr</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Stdio</span><span class="op">></span>, } <span class="comment">// Create a new type for argv, so that we can make it `Send`</span> <span class="kw">struct</span> <span class="ident">Argv</span>(<span class="ident">Vec</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span><span class="op">></span>); <span class="comment">// It is safe to make Argv Send, because it contains pointers to memory owned by `Command.args`</span> <span class="kw">unsafe</span> <span class="kw">impl</span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Argv</span> {} <span class="comment">// passed back to std::process with the pipes connected to the child, if any</span> <span class="comment">// were requested</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">StdioPipes</span> { <span class="kw">pub</span> <span class="ident">stdin</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">AnonPipe</span><span class="op">></span>, <span class="kw">pub</span> <span class="ident">stdout</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">AnonPipe</span><span class="op">></span>, <span class="kw">pub</span> <span class="ident">stderr</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">AnonPipe</span><span class="op">></span>, } <span class="comment">// passed to do_exec() with configuration of what the child stdio should look</span> <span class="comment">// like</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ChildPipes</span> { <span class="kw">pub</span> <span class="ident">stdin</span>: <span class="ident">ChildStdio</span>, <span class="kw">pub</span> <span class="ident">stdout</span>: <span class="ident">ChildStdio</span>, <span class="kw">pub</span> <span class="ident">stderr</span>: <span class="ident">ChildStdio</span>, } <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">ChildStdio</span> { <span class="ident">Inherit</span>, <span class="ident">Explicit</span>(<span class="ident">c_int</span>), <span class="ident">Owned</span>(<span class="ident">FileDesc</span>), } <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Stdio</span> { <span class="ident">Inherit</span>, <span class="ident">Null</span>, <span class="ident">MakePipe</span>, <span class="ident">Fd</span>(<span class="ident">FileDesc</span>), } <span class="kw">impl</span> <span class="ident">Command</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">program</span>: <span class="kw-2">&</span><span class="ident">OsStr</span>) <span class="op">-></span> <span class="ident">Command</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">saw_nul</span> <span class="op">=</span> <span class="bool-val">false</span>; <span class="kw">let</span> <span class="ident">program</span> <span class="op">=</span> <span class="ident">os2c</span>(<span class="ident">program</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">saw_nul</span>); <span class="ident">Command</span> { <span class="ident">argv</span>: <span class="ident">Argv</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="ident">program</span>.<span class="ident">as_ptr</span>(), <span class="ident">ptr</span>::<span class="ident">null</span>()]), <span class="ident">program</span>, <span class="ident">args</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(), <span class="ident">env</span>: <span class="ident">Default</span>::<span class="ident">default</span>(), <span class="ident">cwd</span>: <span class="prelude-val">None</span>, <span class="ident">uid</span>: <span class="prelude-val">None</span>, <span class="ident">gid</span>: <span class="prelude-val">None</span>, <span class="ident">saw_nul</span>, <span class="ident">closures</span>: <span class="ident">Vec</span>::<span class="ident">new</span>(), <span class="ident">stdin</span>: <span class="prelude-val">None</span>, <span class="ident">stdout</span>: <span class="prelude-val">None</span>, <span class="ident">stderr</span>: <span class="prelude-val">None</span>, } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">arg</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">arg</span>: <span class="kw-2">&</span><span class="ident">OsStr</span>) { <span class="comment">// Overwrite the trailing NULL pointer in `argv` and then add a new null</span> <span class="comment">// pointer.</span> <span class="kw">let</span> <span class="ident">arg</span> <span class="op">=</span> <span class="ident">os2c</span>(<span class="ident">arg</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">saw_nul</span>); <span class="self">self</span>.<span class="ident">argv</span>.<span class="number">0</span>[<span class="self">self</span>.<span class="ident">args</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">1</span>] <span class="op">=</span> <span class="ident">arg</span>.<span class="ident">as_ptr</span>(); <span class="self">self</span>.<span class="ident">argv</span>.<span class="number">0</span>.<span class="ident">push</span>(<span class="ident">ptr</span>::<span class="ident">null</span>()); <span class="comment">// Also make sure we keep track of the owned value to schedule a</span> <span class="comment">// destructor for this memory.</span> <span class="self">self</span>.<span class="ident">args</span>.<span class="ident">push</span>(<span class="ident">arg</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">cwd</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">dir</span>: <span class="kw-2">&</span><span class="ident">OsStr</span>) { <span class="self">self</span>.<span class="ident">cwd</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">os2c</span>(<span class="ident">dir</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">saw_nul</span>)); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">uid</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">uid_t</span>) { <span class="self">self</span>.<span class="ident">uid</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">id</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">gid</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">id</span>: <span class="ident">gid_t</span>) { <span class="self">self</span>.<span class="ident">gid</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">id</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">saw_nul</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">saw_nul</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_argv</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Vec</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span><span class="op">></span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">argv</span>.<span class="number">0</span> } <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_cwd</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">CString</span><span class="op">></span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">cwd</span> } <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_uid</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">uid_t</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">uid</span> } <span class="attribute">#[<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span> <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_gid</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">gid_t</span><span class="op">></span> { <span class="self">self</span>.<span class="ident">gid</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_closures</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">Box</span><span class="op"><</span><span class="ident">FnMut</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">>></span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">closures</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">before_exec</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">f</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">FnMut</span>() <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> <span class="op">+</span> <span class="ident">Send</span> <span class="op">+</span> <span class="ident">Sync</span><span class="op">></span>) { <span class="self">self</span>.<span class="ident">closures</span>.<span class="ident">push</span>(<span class="ident">f</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stdin</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">stdin</span>: <span class="ident">Stdio</span>) { <span class="self">self</span>.<span class="ident">stdin</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">stdin</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stdout</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">stdout</span>: <span class="ident">Stdio</span>) { <span class="self">self</span>.<span class="ident">stdout</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">stdout</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">stderr</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">stderr</span>: <span class="ident">Stdio</span>) { <span class="self">self</span>.<span class="ident">stderr</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">stderr</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">env_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">CommandEnv</span><span class="op"><</span><span class="ident">DefaultEnvKey</span><span class="op">></span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">env</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">capture_env</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">CStringArray</span><span class="op">></span> { <span class="kw">let</span> <span class="ident">maybe_env</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">env</span>.<span class="ident">capture_if_changed</span>(); <span class="ident">maybe_env</span>.<span class="ident">map</span>(<span class="op">|</span><span class="ident">env</span><span class="op">|</span> <span class="ident">construct_envp</span>(<span class="ident">env</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">saw_nul</span>)) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">setup_io</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">default</span>: <span class="ident">Stdio</span>, <span class="ident">needs_stdin</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">StdioPipes</span>, <span class="ident">ChildPipes</span>)<span class="op">></span> { <span class="kw">let</span> <span class="ident">null</span> <span class="op">=</span> <span class="ident">Stdio</span>::<span class="ident">Null</span>; <span class="kw">let</span> <span class="ident">default_stdin</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">needs_stdin</span> {<span class="kw-2">&</span><span class="ident">default</span>} <span class="kw">else</span> {<span class="kw-2">&</span><span class="ident">null</span>}; <span class="kw">let</span> <span class="ident">stdin</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">stdin</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap_or</span>(<span class="ident">default_stdin</span>); <span class="kw">let</span> <span class="ident">stdout</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">stdout</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap_or</span>(<span class="kw-2">&</span><span class="ident">default</span>); <span class="kw">let</span> <span class="ident">stderr</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">stderr</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap_or</span>(<span class="kw-2">&</span><span class="ident">default</span>); <span class="kw">let</span> (<span class="ident">their_stdin</span>, <span class="ident">our_stdin</span>) <span class="op">=</span> <span class="ident">stdin</span>.<span class="ident">to_child_stdio</span>(<span class="bool-val">true</span>)<span class="question-mark">?</span>; <span class="kw">let</span> (<span class="ident">their_stdout</span>, <span class="ident">our_stdout</span>) <span class="op">=</span> <span class="ident">stdout</span>.<span class="ident">to_child_stdio</span>(<span class="bool-val">false</span>)<span class="question-mark">?</span>; <span class="kw">let</span> (<span class="ident">their_stderr</span>, <span class="ident">our_stderr</span>) <span class="op">=</span> <span class="ident">stderr</span>.<span class="ident">to_child_stdio</span>(<span class="bool-val">false</span>)<span class="question-mark">?</span>; <span class="kw">let</span> <span class="ident">ours</span> <span class="op">=</span> <span class="ident">StdioPipes</span> { <span class="ident">stdin</span>: <span class="ident">our_stdin</span>, <span class="ident">stdout</span>: <span class="ident">our_stdout</span>, <span class="ident">stderr</span>: <span class="ident">our_stderr</span>, }; <span class="kw">let</span> <span class="ident">theirs</span> <span class="op">=</span> <span class="ident">ChildPipes</span> { <span class="ident">stdin</span>: <span class="ident">their_stdin</span>, <span class="ident">stdout</span>: <span class="ident">their_stdout</span>, <span class="ident">stderr</span>: <span class="ident">their_stderr</span>, }; <span class="prelude-val">Ok</span>((<span class="ident">ours</span>, <span class="ident">theirs</span>)) } } <span class="kw">fn</span> <span class="ident">os2c</span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">OsStr</span>, <span class="ident">saw_nul</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">CString</span> { <span class="ident">CString</span>::<span class="ident">new</span>(<span class="ident">s</span>.<span class="ident">as_bytes</span>()).<span class="ident">unwrap_or_else</span>(<span class="op">|</span><span class="ident">_e</span><span class="op">|</span> { <span class="kw-2">*</span><span class="ident">saw_nul</span> <span class="op">=</span> <span class="bool-val">true</span>; <span class="ident">CString</span>::<span class="ident">new</span>(<span class="string">"<string-with-nul>"</span>).<span class="ident">unwrap</span>() }) } <span class="comment">// Helper type to manage ownership of the strings within a C-style array.</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CStringArray</span> { <span class="ident">items</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">CString</span><span class="op">></span>, <span class="ident">ptrs</span>: <span class="ident">Vec</span><span class="op"><</span><span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span><span class="op">></span> } <span class="kw">impl</span> <span class="ident">CStringArray</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_capacity</span>(<span class="ident">capacity</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="self">Self</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">CStringArray</span> { <span class="ident">items</span>: <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">capacity</span>), <span class="ident">ptrs</span>: <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">capacity</span><span class="op">+</span><span class="number">1</span>) }; <span class="ident">result</span>.<span class="ident">ptrs</span>.<span class="ident">push</span>(<span class="ident">ptr</span>::<span class="ident">null</span>()); <span class="ident">result</span> } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">push</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">item</span>: <span class="ident">CString</span>) { <span class="kw">let</span> <span class="ident">l</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">ptrs</span>.<span class="ident">len</span>(); <span class="self">self</span>.<span class="ident">ptrs</span>[<span class="ident">l</span><span class="op">-</span><span class="number">1</span>] <span class="op">=</span> <span class="ident">item</span>.<span class="ident">as_ptr</span>(); <span class="self">self</span>.<span class="ident">ptrs</span>.<span class="ident">push</span>(<span class="ident">ptr</span>::<span class="ident">null</span>()); <span class="self">self</span>.<span class="ident">items</span>.<span class="ident">push</span>(<span class="ident">item</span>); } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">as_ptr</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">*</span><span class="kw">const</span> <span class="kw-2">*</span><span class="kw">const</span> <span class="ident">c_char</span> { <span class="self">self</span>.<span class="ident">ptrs</span>.<span class="ident">as_ptr</span>() } } <span class="kw">fn</span> <span class="ident">construct_envp</span>(<span class="ident">env</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="ident">DefaultEnvKey</span>, <span class="ident">OsString</span><span class="op">></span>, <span class="ident">saw_nul</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">CStringArray</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">result</span> <span class="op">=</span> <span class="ident">CStringArray</span>::<span class="ident">with_capacity</span>(<span class="ident">env</span>.<span class="ident">len</span>()); <span class="kw">for</span> (<span class="ident">k</span>, <span class="ident">v</span>) <span class="kw">in</span> <span class="ident">env</span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">k</span>: <span class="ident">OsString</span> <span class="op">=</span> <span class="ident">k</span>.<span class="ident">into</span>(); <span class="comment">// Reserve additional space for '=' and null terminator</span> <span class="ident">k</span>.<span class="ident">reserve_exact</span>(<span class="ident">v</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="number">2</span>); <span class="ident">k</span>.<span class="ident">push</span>(<span class="string">"="</span>); <span class="ident">k</span>.<span class="ident">push</span>(<span class="kw-2">&</span><span class="ident">v</span>); <span class="comment">// Add the new entry into the array</span> <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">item</span>) <span class="op">=</span> <span class="ident">CString</span>::<span class="ident">new</span>(<span class="ident">k</span>.<span class="ident">into_vec</span>()) { <span class="ident">result</span>.<span class="ident">push</span>(<span class="ident">item</span>); } <span class="kw">else</span> { <span class="kw-2">*</span><span class="ident">saw_nul</span> <span class="op">=</span> <span class="bool-val">true</span>; } } <span class="ident">result</span> } <span class="kw">impl</span> <span class="ident">Stdio</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_child_stdio</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">readable</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>(<span class="ident">ChildStdio</span>, <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">AnonPipe</span><span class="op">></span>)<span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">Stdio</span>::<span class="ident">Inherit</span> <span class="op">=></span> { <span class="prelude-val">Ok</span>((<span class="ident">ChildStdio</span>::<span class="ident">Inherit</span>, <span class="prelude-val">None</span>)) }, <span class="comment">// Make sure that the source descriptors are not an stdio</span> <span class="comment">// descriptor, otherwise the order which we set the child's</span> <span class="comment">// descriptors may blow away a descriptor which we are hoping to</span> <span class="comment">// save. For example, suppose we want the child's stderr to be the</span> <span class="comment">// parent's stdout, and the child's stdout to be the parent's</span> <span class="comment">// stderr. No matter which we dup first, the second will get</span> <span class="comment">// overwritten prematurely.</span> <span class="ident">Stdio</span>::<span class="ident">Fd</span>(<span class="kw-2">ref</span> <span class="ident">fd</span>) <span class="op">=></span> { <span class="kw">if</span> <span class="ident">fd</span>.<span class="ident">raw</span>() <span class="op">>=</span> <span class="number">0</span> <span class="op">&&</span> <span class="ident">fd</span>.<span class="ident">raw</span>() <span class="op"><=</span> <span class="ident">libc</span>::<span class="ident">STDERR_FILENO</span> { <span class="prelude-val">Ok</span>((<span class="ident">ChildStdio</span>::<span class="ident">Owned</span>(<span class="ident">fd</span>.<span class="ident">duplicate</span>()<span class="question-mark">?</span>), <span class="prelude-val">None</span>)) } <span class="kw">else</span> { <span class="prelude-val">Ok</span>((<span class="ident">ChildStdio</span>::<span class="ident">Explicit</span>(<span class="ident">fd</span>.<span class="ident">raw</span>()), <span class="prelude-val">None</span>)) } } <span class="ident">Stdio</span>::<span class="ident">MakePipe</span> <span class="op">=></span> { <span class="kw">let</span> (<span class="ident">reader</span>, <span class="ident">writer</span>) <span class="op">=</span> <span class="ident">pipe</span>::<span class="ident">anon_pipe</span>()<span class="question-mark">?</span>; <span class="kw">let</span> (<span class="ident">ours</span>, <span class="ident">theirs</span>) <span class="op">=</span> <span class="kw">if</span> <span class="ident">readable</span> { (<span class="ident">writer</span>, <span class="ident">reader</span>) } <span class="kw">else</span> { (<span class="ident">reader</span>, <span class="ident">writer</span>) }; <span class="prelude-val">Ok</span>((<span class="ident">ChildStdio</span>::<span class="ident">Owned</span>(<span class="ident">theirs</span>.<span class="ident">into_fd</span>()), <span class="prelude-val">Some</span>(<span class="ident">ours</span>))) } <span class="ident">Stdio</span>::<span class="ident">Null</span> <span class="op">=></span> { <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">opts</span> <span class="op">=</span> <span class="ident">OpenOptions</span>::<span class="ident">new</span>(); <span class="ident">opts</span>.<span class="ident">read</span>(<span class="ident">readable</span>); <span class="ident">opts</span>.<span class="ident">write</span>(<span class="op">!</span><span class="ident">readable</span>); <span class="kw">let</span> <span class="ident">path</span> <span class="op">=</span> <span class="kw">unsafe</span> { <span class="ident">CStr</span>::<span class="ident">from_ptr</span>(<span class="string">"/dev/null\0"</span>.<span class="ident">as_ptr</span>() <span class="kw">as</span> <span class="kw-2">*</span><span class="kw">const</span> _) }; <span class="kw">let</span> <span class="ident">fd</span> <span class="op">=</span> <span class="ident">File</span>::<span class="ident">open_c</span>(<span class="kw-2">&</span><span class="ident">path</span>, <span class="kw-2">&</span><span class="ident">opts</span>)<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>((<span class="ident">ChildStdio</span>::<span class="ident">Owned</span>(<span class="ident">fd</span>.<span class="ident">into_fd</span>()), <span class="prelude-val">None</span>)) } } } } <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">AnonPipe</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Stdio</span> { <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">pipe</span>: <span class="ident">AnonPipe</span>) <span class="op">-></span> <span class="ident">Stdio</span> { <span class="ident">Stdio</span>::<span class="ident">Fd</span>(<span class="ident">pipe</span>.<span class="ident">into_fd</span>()) } } <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">File</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Stdio</span> { <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">file</span>: <span class="ident">File</span>) <span class="op">-></span> <span class="ident">Stdio</span> { <span class="ident">Stdio</span>::<span class="ident">Fd</span>(<span class="ident">file</span>.<span class="ident">into_fd</span>()) } } <span class="kw">impl</span> <span class="ident">ChildStdio</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">fd</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">c_int</span><span class="op">></span> { <span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> { <span class="ident">ChildStdio</span>::<span class="ident">Inherit</span> <span class="op">=></span> <span class="prelude-val">None</span>, <span class="ident">ChildStdio</span>::<span class="ident">Explicit</span>(<span class="ident">fd</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">fd</span>), <span class="ident">ChildStdio</span>::<span class="ident">Owned</span>(<span class="kw-2">ref</span> <span class="ident">fd</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">fd</span>.<span class="ident">raw</span>()), } } } <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Command</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"{:?}"</span>, <span class="self">self</span>.<span class="ident">program</span>)<span class="question-mark">?</span>; <span class="kw">for</span> <span class="ident">arg</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">args</span> { <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">" {:?}"</span>, <span class="ident">arg</span>)<span class="question-mark">?</span>; } <span class="prelude-val">Ok</span>(()) } } <span class="doccomment">/// Unix exit statuses</span> <span class="attribute">#[<span class="ident">derive</span>(<span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span> <span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ExitStatus</span>(<span class="ident">c_int</span>); <span class="kw">impl</span> <span class="ident">ExitStatus</span> { <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">status</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">ExitStatus</span> { <span class="ident">ExitStatus</span>(<span class="ident">status</span>) } <span class="kw">fn</span> <span class="ident">exited</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">WIFEXITED</span>(<span class="self">self</span>.<span class="number">0</span>) } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">success</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> { <span class="self">self</span>.<span class="ident">code</span>() <span class="op">==</span> <span class="prelude-val">Some</span>(<span class="number">0</span>) } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">code</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> { <span class="kw">if</span> <span class="self">self</span>.<span class="ident">exited</span>() { <span class="prelude-val">Some</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">WEXITSTATUS</span>(<span class="self">self</span>.<span class="number">0</span>) }) } <span class="kw">else</span> { <span class="prelude-val">None</span> } } <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">signal</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> { <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">exited</span>() { <span class="prelude-val">Some</span>(<span class="kw">unsafe</span> { <span class="ident">libc</span>::<span class="ident">WTERMSIG</span>(<span class="self">self</span>.<span class="number">0</span>) }) } <span class="kw">else</span> { <span class="prelude-val">None</span> } } } <span class="kw">impl</span> <span class="ident">From</span><span class="op"><</span><span class="ident">c_int</span><span class="op">></span> <span class="kw">for</span> <span class="ident">ExitStatus</span> { <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">a</span>: <span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">ExitStatus</span> { <span class="ident">ExitStatus</span>(<span class="ident">a</span>) } } <span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">ExitStatus</span> { <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> { <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">code</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">code</span>() { <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"exit code: {}"</span>, <span class="ident">code</span>) } <span class="kw">else</span> { <span class="kw">let</span> <span class="ident">signal</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">signal</span>().<span class="ident">unwrap</span>(); <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">"signal: {}"</span>, <span class="ident">signal</span>) } } } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">test</span>, <span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>)))]</span> <span class="kw">mod</span> <span class="ident">tests</span> { <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; <span class="kw">use</span> <span class="ident">ffi</span>::<span class="ident">OsStr</span>; <span class="kw">use</span> <span class="ident">mem</span>; <span class="kw">use</span> <span class="ident">ptr</span>; <span class="kw">use</span> <span class="ident">libc</span>; <span class="kw">use</span> <span class="ident">sys</span>::<span class="ident">cvt</span>; <span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">t</span> { (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>:<span class="ident">expr</span>) <span class="op">=></span> { <span class="kw">match</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span> { <span class="prelude-val">Ok</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="ident">t</span>, <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="macro">panic</span><span class="macro">!</span>(<span class="string">"received error for `{}`: {}"</span>, <span class="macro">stringify</span><span class="macro">!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">e</span>), <span class="ident">e</span>), } } } <span class="comment">// Android with api less than 21 define sig* functions inline, so it is not</span> <span class="comment">// available for dynamic link. Implementing sigemptyset and sigaddset allow us</span> <span class="comment">// to support older Android version (independent of libc version).</span> <span class="comment">// The following implementations are based on https://git.io/vSkNf</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>))]</span> <span class="kw">extern</span> { <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, <span class="ident">link_name</span> <span class="op">=</span> <span class="string">"__sigemptyset14"</span>)]</span> <span class="kw">fn</span> <span class="ident">sigemptyset</span>(<span class="ident">set</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">sigset_t</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">c_int</span>; <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"netbsd"</span>, <span class="ident">link_name</span> <span class="op">=</span> <span class="string">"__sigaddset14"</span>)]</span> <span class="kw">fn</span> <span class="ident">sigaddset</span>(<span class="ident">set</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">sigset_t</span>, <span class="ident">signum</span>: <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">c_int</span>; } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">sigemptyset</span>(<span class="ident">set</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">sigset_t</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">c_int</span> { <span class="ident">libc</span>::<span class="ident">memset</span>(<span class="ident">set</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> _, <span class="number">0</span>, <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">sigset_t</span><span class="op">></span>()); <span class="kw">return</span> <span class="number">0</span>; } <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"android"</span>)]</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">sigaddset</span>(<span class="ident">set</span>: <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">libc</span>::<span class="ident">sigset_t</span>, <span class="ident">signum</span>: <span class="ident">libc</span>::<span class="ident">c_int</span>) <span class="op">-></span> <span class="ident">libc</span>::<span class="ident">c_int</span> { <span class="kw">use</span> <span class="ident">slice</span>; <span class="kw">let</span> <span class="ident">raw</span> <span class="op">=</span> <span class="ident">slice</span>::<span class="ident">from_raw_parts_mut</span>(<span class="ident">set</span> <span class="kw">as</span> <span class="kw-2">*</span><span class="kw-2">mut</span> <span class="ident">u8</span>, <span class="ident">mem</span>::<span class="ident">size_of</span>::<span class="op"><</span><span class="ident">libc</span>::<span class="ident">sigset_t</span><span class="op">></span>()); <span class="kw">let</span> <span class="ident">bit</span> <span class="op">=</span> (<span class="ident">signum</span> <span class="op">-</span> <span class="number">1</span>) <span class="kw">as</span> <span class="ident">usize</span>; <span class="ident">raw</span>[<span class="ident">bit</span> <span class="op">/</span> <span class="number">8</span>] <span class="op">|=</span> <span class="number">1</span> <span class="op"><<</span> (<span class="ident">bit</span> <span class="op">%</span> <span class="number">8</span>); <span class="kw">return</span> <span class="number">0</span>; } <span class="comment">// See #14232 for more information, but it appears that signal delivery to a</span> <span class="comment">// newly spawned process may just be raced in the macOS, so to prevent this</span> <span class="comment">// test from being flaky we ignore it on macOS.</span> <span class="attribute">#[<span class="ident">test</span>]</span> <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"macos"</span>, <span class="ident">ignore</span>)]</span> <span class="comment">// When run under our current QEMU emulation test suite this test fails,</span> <span class="comment">// although the reason isn't very clear as to why. For now this test is</span> <span class="comment">// ignored there.</span> <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"arm"</span>, <span class="ident">ignore</span>)]</span> <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">"aarch64"</span>, <span class="ident">ignore</span>)]</span> <span class="kw">fn</span> <span class="ident">test_process_mask</span>() { <span class="kw">unsafe</span> { <span class="comment">// Test to make sure that a signal mask does not get inherited.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cmd</span> <span class="op">=</span> <span class="ident">Command</span>::<span class="ident">new</span>(<span class="ident">OsStr</span>::<span class="ident">new</span>(<span class="string">"cat"</span>)); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span>: <span class="ident">libc</span>::<span class="ident">sigset_t</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>(); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">old_set</span>: <span class="ident">libc</span>::<span class="ident">sigset_t</span> <span class="op">=</span> <span class="ident">mem</span>::<span class="ident">uninitialized</span>(); <span class="macro">t</span><span class="macro">!</span>(<span class="ident">cvt</span>(<span class="ident">sigemptyset</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">set</span>))); <span class="macro">t</span><span class="macro">!</span>(<span class="ident">cvt</span>(<span class="ident">sigaddset</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">set</span>, <span class="ident">libc</span>::<span class="ident">SIGINT</span>))); <span class="macro">t</span><span class="macro">!</span>(<span class="ident">cvt</span>(<span class="ident">libc</span>::<span class="ident">pthread_sigmask</span>(<span class="ident">libc</span>::<span class="ident">SIG_SETMASK</span>, <span class="kw-2">&</span><span class="ident">set</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">old_set</span>))); <span class="ident">cmd</span>.<span class="ident">stdin</span>(<span class="ident">Stdio</span>::<span class="ident">MakePipe</span>); <span class="ident">cmd</span>.<span class="ident">stdout</span>(<span class="ident">Stdio</span>::<span class="ident">MakePipe</span>); <span class="kw">let</span> (<span class="kw-2">mut</span> <span class="ident">cat</span>, <span class="kw-2">mut</span> <span class="ident">pipes</span>) <span class="op">=</span> <span class="macro">t</span><span class="macro">!</span>(<span class="ident">cmd</span>.<span class="ident">spawn</span>(<span class="ident">Stdio</span>::<span class="ident">Null</span>, <span class="bool-val">true</span>)); <span class="kw">let</span> <span class="ident">stdin_write</span> <span class="op">=</span> <span class="ident">pipes</span>.<span class="ident">stdin</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>(); <span class="kw">let</span> <span class="ident">stdout_read</span> <span class="op">=</span> <span class="ident">pipes</span>.<span class="ident">stdout</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>(); <span class="macro">t</span><span class="macro">!</span>(<span class="ident">cvt</span>(<span class="ident">libc</span>::<span class="ident">pthread_sigmask</span>(<span class="ident">libc</span>::<span class="ident">SIG_SETMASK</span>, <span class="kw-2">&</span><span class="ident">old_set</span>, <span class="ident">ptr</span>::<span class="ident">null_mut</span>()))); <span class="macro">t</span><span class="macro">!</span>(<span class="ident">cvt</span>(<span class="ident">libc</span>::<span class="ident">kill</span>(<span class="ident">cat</span>.<span class="ident">id</span>() <span class="kw">as</span> <span class="ident">libc</span>::<span class="ident">pid_t</span>, <span class="ident">libc</span>::<span class="ident">SIGINT</span>))); <span class="comment">// We need to wait until SIGINT is definitely delivered. The</span> <span class="comment">// easiest way is to write something to cat, and try to read it</span> <span class="comment">// back: if SIGINT is unmasked, it'll get delivered when cat is</span> <span class="comment">// next scheduled.</span> <span class="kw">let</span> _ <span class="op">=</span> <span class="ident">stdin_write</span>.<span class="ident">write</span>(<span class="string">b"Hello"</span>); <span class="ident">drop</span>(<span class="ident">stdin_write</span>); <span class="comment">// Either EOF or failure (EPIPE) is okay.</span> <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>; <span class="number">5</span>]; <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">ret</span>) <span class="op">=</span> <span class="ident">stdout_read</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>) { <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">ret</span>, <span class="number">0</span>); } <span class="macro">t</span><span class="macro">!</span>(<span class="ident">cat</span>.<span class="ident">wait</span>()); } } } </pre> </section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt><kbd>?</kbd></dt> <dd>Show this help dialog</dd> <dt><kbd>S</kbd></dt> <dd>Focus the search field</dd> <dt><kbd>↑</kbd></dt> <dd>Move up in search results</dd> <dt><kbd>↓</kbd></dt> <dd>Move down in search results</dd> <dt><kbd>↹</kbd></dt> <dd>Switch tab</dd> <dt><kbd>⏎</kbd></dt> <dd>Go to active search result</dd> <dt><kbd>+</kbd></dt> <dd>Expand all sections</dd> <dt><kbd>-</kbd></dt> <dd>Collapse all sections</dd> </dl> </div> <div class="infos"> <h2>Search Tricks</h2> <p> Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type. </p> <p> Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>. </p> <p> Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>) </p> </div> </div> </aside> <script> window.rootPath = "../../../../../"; window.currentCrate = "std"; </script> <script src="../../../../../main.js"></script> <script defer src="../../../../../search-index.js"></script> </body> </html>